Method of and apparatus for twisting yarn



April 28, 1931. c. B. ROCKWELL. JR.. ET AL 1,302,671

IETHOD OF AND APPARATUS FOR TWISTING YARN Filed March 31, 1928 ill...

Inventor's: 5: fiockwezgJi; and WhiworZfi/Ffiwdj v flfiarreey- Patented Apr. 28, 1931 UNITED STATES PATENT ,OFFICE CHARLES B. ROCKWELL, JR. AND WHITW'OR-TH IE. BIRD, OF BRISTOL, RHODE ISLAND,

ASSIGNORS TO COLLINS & AIKMAN CORPORATION, OF PHILADELPHIA, PENNSYL- VANIA, A. CORPORATION OF DELAWARE METHOD OF AN D APPARATUS FOR TWISTIN G YARN' Application filed March 31, 1928. Serial No. 266,156.

Our invention is designed to provide a smooth, clean, yarn having a uniform twist and free from pock-mark curls, snarls or interlaced fibres.

J The leading objects of our invention are the improvement of the smoothness of the yarn by equalizing the twist and giving it effect at a definite point, and by eliminating enveloping fibre curls or pock-mark curls 10. resulting from the overlapping and entanglement of long uncontrolled fibres of the strands or ends being twisted as such ends converge to the point of twist. Such overlapping and entanglement of the uncontrolled fibres of the ends have heretofore commonly resulted in a snarl of fibres enveloping the two ends as they converge to the point of twist and binding them together and forming enveloping fibre curls which cause serious difficulties.

In accordance with our invention, the

. point at which the twist between the strands or ends takes effect is definitely controlled,

and until such point is reached the ends or strands are maintained in spaced relation and subjected to a slight rotary motion in contact with guides converging to the point of twisting. Such rotary motion induced from the two ply twist in the spaced ends in contact with the guides, in conjunction with the forward motion of the ends toward the point of twisting, tends to lay the loose fibres all in one direction and lap them around the respective ends; the long normally uncontrolled fibres being maintained in. such lapped relation around the respective ends or strands until the twisting of the two strands together takes place, so that such loose fibres are twisted in the yarn before they can again become uncontrolled.

To carry out this improved method in an efficient and expeditious manner, we provide, between the sources of supply of the ends and the twisting means, guiding mechanism by which each single end is held apart with its normally loose fibres lapped arousd it by COIllflrl with the guides until the instant the two ply twist takes effect. Such guiding mechanism is preferably of V-shape and 59 comprises surfaces containing grooves forming tracks for the yarn and converging to a knife edge where the twisting of the ends takes effect and from which point the twisted yarn preferably passes through a pot eye directly over and in alignment with the axis of the twist-bobbin on which the yarn is wound. Usual forms of twisting machines may be adapted for carrying out our method and made to embody our improved apparatus by the attachment of such uiding mecha- 60 nismto the fly board of the rame with the base or wide part of the V'toward and parallel to the front roller.

It will thus be seen that by our invention, the normally loose fibres of spaced ends are 05 separately laid by rotation and forward movement thereof in contact with guides and the ends are twisted together while such normally loose fibres are lapped around the respective ends. Y

The characteristic features and advantages of our improvements will more fully appear from the following description and the accompanying drawing illustrating, somewhat diagrammatically, our invention.

In the drawings, Fig. 1 is a fragmentary front elevation of twisting apparatus embodying our invention; and Fig. 2 is a side elevation thereof.

As illustrated in the drawings, our improvements are applied to a twisting apparatus having front rollers A, A, which ma be either grooved or plane, and over whic the strands or ends H, H are fed from a suitable source of sup ly. 85

A fly board C has fixed thereto a bracket D which supports converging legs B, B arranged in 'the form of a V and having their outer surfaces provided with grooves B", B", which converge to form a knife edge adja- 9 cent to the pot eye E fixed to the fly board and disposed in alignment with the axis of the twist bobbin F projecting above the lifter plate G and on-which the two ply twist is wound in the usual manner.

In the operation of'the device, the separate strands or ends emerging from the front rollers pass through the grooves B", B of the guides B, I3, by which they are spaced apart until they converge atthe point of the V 100.

where they are immediately twisted together. The two ply twist occurring at the point of the V induces a slight rotary motion in each of the single ends as it slides down its groove 5 and this rotary motion in contact with the guide, in conjunction with the forward motion, tendsjto lay the loose fibres all in one direction and laps them around the respective strands where they are held by contact with the ides until they are twisted into theyarn by t 1e two ply twist taking place at the point. Having described our invention, we claim: 1. The method of twisting yarn which comprises laying normally loose fibres of spaced ends by rotation and forward movement thereof in contact with guides spacing the ends and preventing premature entanglement of fibres on the respective ends before the twistin together of such ends, and twisting e theen s together while the normally loose fibres'are lapped around the respective ends. 2. The method of twisting yarn which comprises slightly twisting spaced ends in contact with converging guides to lay the loose fibres on the ends while spaced by the guides and prevented thereby rom entanglement prior to twisting together of the ends, and twisting said ends together at the point of conver ence of the guides while the normally loose bres so are wrapped around the ends.

3. The method of twisting yarn which comprises passing spaced ends over converging guides spacing such ends and preventing premature entanglement of fibres of the respective ends before the bodily twisting together of such ends and twisting such ends together at the point of convergence of the guides.

4. In yarn'twisting apparatus, the combination with a source of supply of ends to be 40 twisted and means for twisting such ends together, of converging guides disposed between said source of supply and twisting means and over which ends to be twisted separately pass and by which they are spaced to prevent premature entanglement of loose fibres on the respective ends.

5. In yarn twisting apparatus, the combination with a source of supply of ends to be twisted and means for twisting said ends, of converging guide members disposed between said source of suppl and twisting means and having external en engaging surfaces, converging to an edge and an eye adjacent to the point of convergence of said guide members; 6. In twisting apparatus, the combination with supply rollers and a bobbin, of externally grooved guides converging to a knife edge between said rollers and bobbin,and an eye adjacent to said knife edge and in substantial c9 alignment with the axis of said bobbin. In testimony whereof we have hereunto set our names this 29th day of March,'1928.

CHARLES B. ROGKVVELL, JR. WHITW'ORTH F BIRD. 

